.banner {
    width: 400px;
    height: 300px;
    margin: 1em auto;
    overflow: hidden;
    position: relative;
}

.banner .imgs {
    width: 1200px;
    height: 300px;
    position: relative;
}

.banner .imgs a img {
    float: left;
    width: 400px;
    height: 300px;
}

.banner .modal {
    position: absolute;
    width: 100%;
    height: 40px;
    box-sizing: border-box;
    padding: 0 20px;
    left: 0;
    line-height: 40px;
    bottom: 0;
    background-color: rgba(0, 0, 0, .3);
}

.banner .modal .lefttile {
    float: left;
    color: aliceblue;
    font-weight: bold;
}

.banner .modal .dots {
    float: right;
}


.banner .modal .dots ul li {
    display: inline-block;
    width: 5px;
    height: 5px;
    background-color: #ccc;
    margin: 0 2px;
    border-radius: 50%;
}

.banner .modal .dots ul li:hover {
    background-color: lightblue;
}

.banner .mute .left,
.banner .mute .right {
    width: 50px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    font-size: 3em;
    border-radius: 50%;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto;
    color: #fff;
}

.banner .mute .left:hover,
.banner .mute .right:hover {
    background-color: aliceblue;
    color: blue;
}

.banner .mute .left {
    left: 20px;
}


.banner .mute .right {
    right: 20px;
}